finally got my brushless

[captain harlock]

You might decrease the cogging problem with higher voltage.

Also, im my Futaba 3PK and some other transmitters, you can adjust your motor's acceleration so that it jumps directly from the lowest point of acceleration to a haigher level of acceleration. It simply wont cog since you are actually taking off from like 10% of acceleration. You can actually make your car launch at 100% of acceleration by only touching the throttle trigger, but 5-10% is very ideal.
Hope you have this feature in your radio.

[BrianG]

At slow rpms, the ESC has a hard time reading the rotor position so it turns off and on giving you the cogging effect. Some ESCs are better at reducing this issue than others though.

You can try with the Captain suggested (good idea!), but don't set your Tx to accelerate too high or you'll damage the drivetrain or just spin the wheels from the instant torque. You just need to adjust it to the point where it doesn't cog at minimum throttle.

Gearing down a little might help too, although you'll lose a little high end speed.